diff --git a/pynfe/processamento/serializacao.py b/pynfe/processamento/serializacao.py
index 31efddf..da63f31 100644
--- a/pynfe/processamento/serializacao.py
+++ b/pynfe/processamento/serializacao.py
@@ -440,7 +440,8 @@ class SerializacaoXML(Serializacao):
         raiz.attrib['Id'] = nota_fiscal.identificador_unico
 
         if six.PY2:
-            tz = datetime.now().strftime('%z')
+            from dateutil.tz import tzlocal
+            tz = datetime.now(tzlocal()).strftime("%z")
         else:
             tz = datetime.now().astimezone().strftime('%z')
         tz = "{}:{}".format(tz[:-2], tz[-2:])
@@ -674,7 +675,8 @@ class SerializacaoXML(Serializacao):
 
     def serializar_evento(self, evento, tag_raiz='evento', retorna_string=False):
         if six.PY2:
-            tz = datetime.now().strftime("%z")
+            from dateutil.tz import tzlocal
+            tz = datetime.now(tzlocal()).strftime("%z")
         else:
             tz = datetime.now().astimezone().strftime('%z')
         tz = "{}:{}".format(tz[:-2], tz[-2:])
diff --git a/requirements.txt b/requirements.txt
index 7115abc..ced2838 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,6 +4,7 @@ requests
 lxml
 signxml
 six >= 1.10.0
+python-dateutil >=2.2
 
 # Opcional para NFS-e
 #-r requirements-nfse.txt